244 ON THE MAGNETISATION OF IRON AND OTHER MAGNETIC METALS. 
(1) Swedish wrought iron (Table V.). 
(2) Vickers’ tool steel (Table X.). 
(3) Cobalt (Table XV.). 
(4) Cast iron (Tables VII. and VIII. The points taken from Table VII. are 
marked thus, X, and those from Table VIII. thus, ©.). 
(5) Annealed nickel with 0'75 per cent, of iron (Table XIIL). 
(6) Hard-drawn nickel with 0‘56 per cent, of iron (Table XIV.). 
(7) Hadeield’s manganese steel (Table XII.). 
If the magnetic force instead of the induction 33, had been taken as abscissa, the 
curves (with the exception of those relating to Vickers’ steel and manganese steel) 
would have sensibly lain upon rectangular hyperbolas with <§ = 0 and p, = 1 for 
asymptotes. 
